CVE-2025-1009CRITICAL 9.8EPSS p63.1%

CVE-2025-1009CVE-2025-1009

Description

An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS1.16% probability of exploitation · percentile 63.1% · 2026-06-19T12:03:05Z
Published2025-02-04
Last modified2026-04-13

Underlying weaknesses· 1

CWE-416

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1936613
  2. https://www.mozilla.org/security/advisories/mfsa2025-07/
  3. https://www.mozilla.org/security/advisories/mfsa2025-08/
  4. https://www.mozilla.org/security/advisories/mfsa2025-09/
  5. https://www.mozilla.org/security/advisories/mfsa2025-10/
  6. https://www.mozilla.org/security/advisories/mfsa2025-11/
  7. https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html
  8. https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html

1

TypeTargetConfidenceTier
WeaknessUse After Freecwe-4160%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.